/* mbed Microcontroller Library
 * Copyright (c) 2006-2020 ARM Limited
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/****************************************************************************
 *
 * Copyright 2020 Samsung Electronics All Rights Reserved.
 * SPDX-License-Identifier: Apache-2.0
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/

#ifndef MBEDTLS_SHA256_ALT_H
#define MBEDTLS_SHA256_ALT_H

#include "mbedtls/sha256.h"

#if defined(MBEDTLS_SHA256_ALT)

#include "sss_common.h"

#ifdef __cplusplus
extern "C" {
#endif

#define ST_SHA256_BUF_SIZE ((size_t)  256)
struct mbedtls_sha256_context_s;

/**
 * \brief          SHA-256 context structure
 */
typedef struct mbedtls_sha256_context_s {
    /* for S/W SHA-224 */
    uint32_t total[2];          /*!< The number of Bytes processed.  */
    uint32_t state[8];          /*!< The intermediate digest state.  */
    unsigned char buffer[64];   /*!< The data block being processed. */
    int is224;                  /*!< Determines which function to use:
                                     0: Use SHA-256, or 1: Use SHA-224. */

    /* for H/W SHA-256 */
    uint32_t totals;
    uint32_t hw;
    unsigned char sbuf[ST_SHA256_BUF_SIZE]; /*!< ST_SHA256_BLOCK_SIZE buffer to store values so that algorithm is called once the buffer is filled */
    stOCTET_STRING pstMessage;
    stOCTET_STRING pstDigest;

}
mbedtls_sha256_context;

/**
 * \brief          Initialize SHA-256 context
 *
 * \param ctx      SHA-256 context to be initialized
 */
void mbedtls_sha256_init(mbedtls_sha256_context *ctx);

/**
 * \brief          Clear SHA-256 context
 *
 * \param ctx      SHA-256 context to be cleared
 */
void mbedtls_sha256_free(mbedtls_sha256_context *ctx);

/**
 * \brief          Clone (the state of) a SHA-256 context
 *
 * \param dst      The destination context
 * \param src      The context to be cloned
 */
void mbedtls_sha256_clone(mbedtls_sha256_context *dst,
                          const mbedtls_sha256_context *src);

/**
 * \brief          SHA-256 context setup
 *
 * \param ctx      context to be initialized
 * \param is224    0 = use SHA256, 1 = use SHA224
 *
 * \returns        error code
 */
int mbedtls_sha256_starts_ret(mbedtls_sha256_context *ctx, int is224);

/**
 * \brief          SHA-256 process buffer
 *
 * \param ctx      SHA-256 context
 * \param input    buffer holding the  data
 * \param ilen     length of the input data
 *
 * \returns        error code
 */
int mbedtls_sha256_update_ret(mbedtls_sha256_context *ctx, const unsigned char *input,
                              size_t ilen);

/**
 * \brief          SHA-256 final digest
 *
 * \param ctx      SHA-256 context
 * \param output   SHA-224/256 checksum result
 *
 * \returns        error code
 */
int mbedtls_sha256_finish_ret(mbedtls_sha256_context *ctx, unsigned char output[32]);

/* Internal use */
int mbedtls_internal_sha256_process(mbedtls_sha256_context *ctx, const unsigned char data[64]);

#if !defined(MBEDTLS_DEPRECATED_REMOVED)
#if defined(MBEDTLS_DEPRECATED_WARNING)
#define MBEDTLS_DEPRECATED      __attribute__((deprecated))
#else
#define MBEDTLS_DEPRECATED
#endif
/**
 * \brief          This function starts a SHA-256 checksum calculation.
 *
 * \deprecated     Superseded by mbedtls_sha256_starts_ret() in 2.7.0.
 *
 * \param ctx      The SHA-256 context to initialize.
 * \param is224    Determines which function to use.
 *                 <ul><li>0: Use SHA-256.</li>
 *                 <li>1: Use SHA-224.</li></ul>
 */
MBEDTLS_DEPRECATED void mbedtls_sha256_starts(mbedtls_sha256_context *ctx,
                                              int is224);

/**
 * \brief          This function feeds an input buffer into an ongoing
 *                 SHA-256 checksum calculation.
 *
 * \deprecated     Superseded by mbedtls_sha256_update_ret() in 2.7.0.
 *
 * \param ctx      The SHA-256 context to initialize.
 * \param input    The buffer holding the data.
 * \param ilen     The length of the input data.
 */
MBEDTLS_DEPRECATED void mbedtls_sha256_update(mbedtls_sha256_context *ctx,
                                              const unsigned char *input,
                                              size_t ilen);

/**
 * \brief          This function finishes the SHA-256 operation, and writes
 *                 the result to the output buffer.
 *
 * \deprecated     Superseded by mbedtls_sha256_finish_ret() in 2.7.0.
 *
 * \param ctx      The SHA-256 context.
 * \param output   The SHA-224or SHA-256 checksum result.
 */
MBEDTLS_DEPRECATED void mbedtls_sha256_finish(mbedtls_sha256_context *ctx,
                                              unsigned char output[32]);

/**
 * \brief          This function processes a single data block within
 *                 the ongoing SHA-256 computation. This function is for
 *                 internal use only.
 *
 * \deprecated     Superseded by mbedtls_internal_sha256_process() in 2.7.0.
 *
 * \param ctx      The SHA-256 context.
 * \param data     The buffer holding one block of data.
 */
MBEDTLS_DEPRECATED void mbedtls_sha256_process(mbedtls_sha256_context *ctx,
                                               const unsigned char data[64]);

#undef MBEDTLS_DEPRECATED
#endif /* !MBEDTLS_DEPRECATED_REMOVED */

#ifdef __cplusplus
}
#endif

#endif /* MBEDTLS_SHA256_ALT */

#endif /* sha256_alt.h */
